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Separator of electrospun polyimide composites for lithium-ion batteries
박준서,( Jaritphunshayapat ),정옥희 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Polyimide(PI) composites of separators for lithium-ion batteries (LIBs) was fabricated by electrosprinning with addition of inorganic nanoparticles of SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>. The morphology and mechanical properties were investigated by using a field emission scanning electron microscopy (FESEM) and a universal testing machine. Thermal properties were measured by using a thermal gravimetric analyzer (TGA), a hot oven and a differential scanning calorimeter (DSC). The electrochemical performance of PI composites nanofibers as the separator was analyzed by initial charge-discharge capacity, cycle performance and C-rate capabilities test. The results indicated that the PI/SiO<sub>2-5</sub>% and the PI/Al<sub>2</sub>O<sub>3-5</sub>% composite separators exhibited enhanced separator performances such as tensile strength (34.63 and 38.59MPa cm<sup>-2</sup>) and thermal stability (593.65 and 591.70°C at 15% loss weight) with high porosity (90.55 and 92.78%) and electrolyte uptake (732.41 and 864.20 wt.%). These are compared with physical properties of a commercial separator (SV718), porous polyproplylene in the values of tensile strength of 25.75 Mpa cm<sup>-2</sup>), the thermal stability (381.36°C at 15% loss weight), the porosity (40.51%) and electrolyte uptake (101.10 wt.%). Compared with the SV718 separator, a LiCoO<sub>2</sub>/Li cell assembled with the PI/SiO<sub>2-5</sub>% and the PI/Al<sub>2</sub>O<sub>3-5</sub>% composite separators demonstrated high initial discharge capacity (168.80 and 170.83 mAh g<sup>-1</sup>) at 0.1C, good stable cycle performance and little capacity lost, which kept above 160.76 and 162.39 mAh g-1 at the 50th cycle.
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